you do what you have to do.....there have been stranger set-ups, but as long as it works.....more power to him...give him an "A" for effort....
I can't find the video, but there is a washer that mounts on the wall, I think by Daewoo, several models, one unique model drains into the tank of the toilet, talk about not wasting water or recycle/dual useage if you will.....
think in areas where water is a premium, why not use wash/rinse water to flush your toilet, detergents and bleach would keep it clean......theres even eople during droughts that will save their shower water in buckets to water the lawn and flowers, is this so far fetched?